Derry Posted February 23, 2009 Share Posted February 23, 2009 I left town for the weekend and came back to find a green monti cap with a big white patch in the middle of it. The bleached area in the middle is ringed by a light brown area that looks like the coral expelling its zooxanthellae. From this morning to lunch, it does look like the bleached area is expanding. I've got a second green cap and an orange cap in this tank that are both doing just fine. Any ideas what might be causing this? Derry Current params: Salinity 1.026 Ammonia 0 Nitrite 0 Nitrate 0 Phosphate 0 pH 8.3 dKH 13 Ca 320 (I got a bad Ca test kit that was throwing my readings off for a while - need to bring dKH down and Ca up) Quote Link to comment Share on other sites More sharing options...
Brooks Posted February 23, 2009 Share Posted February 23, 2009 Possibly White-Band Disease? It eats away it coral's tissue at an extremely fast rate. See how fast it's growing, and do some research on the disease. This is one link I found for the disease: Here Quote Link to comment Share on other sites More sharing options...
GKarshens Posted February 23, 2009 Share Posted February 23, 2009 Look on the underside of the coral very closely if possible for Nudibranchs or eggs. I lost a cap to them and it looked just like that when it started. This is what they look like: Quote Link to comment Share on other sites More sharing options...
barderer Posted February 23, 2009 Share Posted February 23, 2009 one parameter you didn't list is temperature. Has it changed dramatically recently? Quote Link to comment Share on other sites More sharing options...
Derry Posted February 23, 2009 Author Share Posted February 23, 2009 My tank usually cycles from 78 and 81. I first saw the bleaching yesterday evening. Of course, last night my return pump seized up and my tank temp dropped to 73 this morning, so that's certainly not helping any. Quote Link to comment Share on other sites More sharing options...
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